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Tobacco smoking

WHAT IS NORMAL FUNCTION OF CELLS?   Every human body consists of billions of small cells. These form different tissues and organs such as skin, bone, blood, liver and many more. The cells in these organs have a variety of functions, the skin cells provide protection for the body, the blood cells transport nutrients and oxygen, the muscle cells enable movements and so on. The cells of the body have varying life spans. Old cells die and are replaced with si...